Updated HumHub to 1.3.15

Webuzo HumHub (ID : 570) package has been updated to version 1.3.15. HumHub is a free social network software and framework built to give you the tools to make communication and collaboration easy and successful. It’s lightweight, powerful and comes with an user-friendly interface. With HumHub you can create your own customized social network, social intranet or huge social enterprise application that really fits your needs.